Unit settings not showing

I have Version 2.0 and have previously deleted a unit from my account. However I've got 3 units on there now and when I double click the names no settings show. How do I enable these so I can delete one of the units please?

Thanks for your reply. I had looked at this article but when I double click on the name no settings or gear icon show, just a circle flashes around the icon on the map. It's strange because it worked previously and I successfully deleted an old unit.

Thanks for looking into this for me. If you could delete the middle unit at the bottom of the screen "pink tracker" I'd be grateful as this did not seem to work when I set it up and I set it up again as a new unit but it's now showing as a duplicate. I appreciate your help.